Fix header path

Author: Zylann

generators/multipass/voxel_tool_multipass_generator.cpp

@@ -7,7 +7,7 @@
 #include "../../util/string/format.h"
 
 #ifdef ZN_GODOT
-#include "../util/godot/core/class_db.h"
+#include "../../util/godot/core/class_db.h"
 #endif
 
 namespace zylann::voxel {